Abstract: A method for preparing quartz glass with low content of hydroxyl and high purity, includes providing silica powders including hydroxyl groups. The silica powders are dehydroxylated, which includes drying the silica powders at a first temperature, heating the silica powders up to a second temperature and introducing a first oxidizing gas including halogen gas, thereby obtaining first dehydroxylated powders, and heating the first dehydroxylated powders up to a third temperature and introducing a second oxidizing gas including oxygen or ozone, thereby obtaining second dehydroxylated powders. The second dehydroxylated powders are heated up to a fourth temperature to obtain a vitrified body. The vitrified body is cooled to obtain the quartz glass with low content of hydroxyl and high purity. The quartz glass prepared by the above method has low content of hydroxyl and high purity. A quartz glass with low content of hydroxyl and high purity is also provided.

Abstract: A detection device includes a frame, a transport mechanism, detection mechanisms, and a grasping mechanism. The transport mechanism includes a feeding line, a first flow line, and a second flow line arranged in parallel on the frame. The detection mechanisms are arranged on the frame and located on two sides of the transport mechanism. The grasping mechanism is arranged on the frame and used to transport workpieces on the feeding line to the detection mechanisms, transport qualified workpieces to the first flow line, and transport unqualified workpieces to the second flow line.

Abstract: A push-pull press-contact apparatus includes holding member capable of being held with fingers; push-pull member connected to the holding member and having push portion, stop portion and pull portion sequentially connected; and pressing member connected to the pull portion from front. An antiseptic case includes case member having mounting space; alcoholic sponge mounted in the mounting space and having slot insertable by push-pull member and pressing member; and lid for covering the case member. Another antiseptic case includes case member having mounting space; alcoholic sponge mounted in the mounting space and having slot insertable by push-pull member and pressing member of push-pull press-contact apparatus; and lid for covering the case member.